DXR is a code search and navigation tool aimed at making sense of large projects. It supports full-text and regex searches as well as structural queries.

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<!DOCTYPE html>
<html class="reftest-wait">
<head>
<script>

function boom()
{
  var frame = document.createElementNS("http://www.w3.org/1999/xhtml", "iframe");
  frame.onload = y; 
  frame.src = "data:text/plain,0"; 
  document.body.appendChild(frame);
  frameDoc = frame.contentDocument;

  function y()
  {
    frameDoc.removeChild(frameDoc.documentElement);

    var xp = new XSLTProcessor;
    xp.importStylesheet(frameDoc);
    try {
      xp.transformToDocument(frameDoc.createTextNode('x'));
    } catch(e) { }

    document.documentElement.removeAttribute("class");
  }
}

</script>
</head>

<body onload="boom();"></body>
</html>